Gastropoda - Euomphalina - Helicotomidae
Alternative spelling: Helicotominae
Full reference: W. Wenz. 1938. Handbuch der Paläozoologie; Gastropoda. Handbuch der Paläozoologie 1-240
Parent taxon: Euomphaloidea according to P. Bouchet et al. 2005
See also Golikov and Starobogatov 1975, Jeffery 2003, Knight et al. 1960, Kosnik 2002, Morris and Cleevely 1981 and Wagner 1999
Sister taxa: Anomphalidae, Elasmonematidae, Euomphalidae, Holopeidae, Kitikamispira, Lesueurillidae, Microdomatidae, Neoplatyteichum, Nettersheimia, Omphalocirridae, Omphalocirrinae, Omphalotrochidae, Ornollus, Planitrochidae, Pseudophoridae, Pycnomphalidae, Rhenomphalus, Serpulospira, Tychobraheidae
Subtaxa: Amphelissa Boucotspira Boucotspira Helicotoma Lophonema Ophiletina Palaeomphalus Paraviviana Walcottoma Yochelsoniella
Ecology: stationary epifaunal suspension feeder
Distribution:
• Jurassic of Hungary (1 collection)
• Devonian of Australia (2)
• Silurian of Sweden (4)
• Ordovician of Australia (4), Canada (21: British Columbia, Nunavut, Ontario, Quebec), China (3), the Czech Republic (1), Estonia (5), Greenland (2), Malaysia (1), North Korea (1), Norway (3), South Korea (1), Sweden (3), the United Kingdom (6), United States (84: Alaska, California, Colorado, Georgia, Illinois, Illinois, Iowa, Indiana, Kentucky, Michigan, Minnesota, Missouri, Nevada, Ohio, Oklahoma, Tennessee, Texas, Virginia, Wisconsin)
• Chazy of Canada (1: Quebec)
• Llandeilo of China (1), United States (1: California)
• Whiterockian of United States (6: Nevada, Virginia)
• Cassinian of Canada (4: Newfoundland and Labrador, Quebec), Greenland (1), United States (38: Missouri, Vermont)
• Arenigian of United States (1: Virginia)
• Arenig of Greenland (4)
Total: 199 collections including 292 occurrences